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Note Allowance for loan losses (Troubled debt restructurings loan count by type of modification) (Detail) - loans | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017
Troubled Debt Restructuring, Debtor, Current Period [Line Items] |  |
Reduction In Interest Rate | 2,059 | 1,346
Extension of Maturity Date | 259 | 125
Combination Interest Rate Reduction Maturity Date Extension | 383 | 376
Other Modifications | 492 | 668
Commercial multi-family |  |
Troubled Debt Restructuring, Debtor, Current Period [Line Items] |  |
Reduction In Interest Rate | 0 |
Extension of Maturity Date | 2 |
Combination Interest Rate Reduction Maturity Date Extension | 0 |
Other Modifications | 0 |
CRE non-owner occupied |  |
Troubled Debt Restructuring, Debtor, Current Period [Line Items] |  |
Reduction In Interest Rate | 3 | 4
Extension of Maturity Date | 17 | 2
Combination Interest Rate Reduction Maturity Date Extension | 0 | 0
Other Modifications | 0 | 0
CRE owner occupied |  |
Troubled Debt Restructuring, Debtor, Current Period [Line Items] |  |
Reduction In Interest Rate | 4 | 4
Extension of Maturity Date | 64 | 17
Combination Interest Rate Reduction Maturity Date Extension | 0 | 0
Other Modifications | 0 | 0
Commercial and industrial |  |
Troubled Debt Restructuring, Debtor, Current Period [Line Items] |  |
Reduction In Interest Rate | 6 | 3
Extension of Maturity Date | 87 | 40
Combination Interest Rate Reduction Maturity Date Extension | 0 | 0
Other Modifications | 0 | 0
Construction |  |
Troubled Debt Restructuring, Debtor, Current Period [Line Items] |  |
Reduction In Interest Rate | 1 |
Extension of Maturity Date | 0 |
Combination Interest Rate Reduction Maturity Date Extension | 0 |
Other Modifications | 0 |
Mortgages |  |
Troubled Debt Restructuring, Debtor, Current Period [Line Items] |  |
Reduction In Interest Rate | 85 | 55
Extension of Maturity Date | 49 | 39
Combination Interest Rate Reduction Maturity Date Extension | 359 | 348
Other Modifications | 57 | 125
Leasing |  |
Troubled Debt Restructuring, Debtor, Current Period [Line Items] |  |
Reduction In Interest Rate | 0 | 0
Extension of Maturity Date | 0 | 1
Combination Interest Rate Reduction Maturity Date Extension | 4 | 9
Other Modifications | 0 | 0
Credit cards |  |
Troubled Debt Restructuring, Debtor, Current Period [Line Items] |  |
Reduction In Interest Rate | 579 | 491
Extension of Maturity Date | 0 | 0
Combination Interest Rate Reduction Maturity Date Extension | 4 | 5
Other Modifications | 432 | 537
Home equity lines of credit |  |
Troubled Debt Restructuring, Debtor, Current Period [Line Items] |  |
Reduction In Interest Rate | 0 | 0
Extension of Maturity Date | 27 | 14
Combination Interest Rate Reduction Maturity Date Extension | 11 | 8
Other Modifications | 1 | 1
Personal Loan |  |
Troubled Debt Restructuring, Debtor, Current Period [Line Items] |  |
Reduction In Interest Rate | 1,356 | 757
Extension of Maturity Date | 6 | 6
Combination Interest Rate Reduction Maturity Date Extension | 0 | 2
Other Modifications | 2 | 3
Auto Loan |  |
Troubled Debt Restructuring, Debtor, Current Period [Line Items] |  |
Reduction In Interest Rate | 0 | 0
Extension of Maturity Date | 7 | 5
Combination Interest Rate Reduction Maturity Date Extension | 3 | 4
Other Modifications | 0 | 1
Other |  |
Troubled Debt Restructuring, Debtor, Current Period [Line Items] |  |
Reduction In Interest Rate | 25 | 32
Extension of Maturity Date | 0 | 1
Combination Interest Rate Reduction Maturity Date Extension | 2 | 0
Other Modifications | 0 | 1

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